Thanks for the 12-20 Orchard photo with the set back axle Tom, interesting to hear about the bolted on rather than riveted axle pivot bracket, I have looked closely at the photograph I posted from the brochure and pretty sure I can see a rivet head.

Well Joe what can we say about the "Industrial 12-20" I think my socks would be off my feet and down on the floor praying east if I found one of them in a barn.
I have some photographs amongst my literature, but when that brochure came up recently on a well known site it just amazed me, not seen a Wallis brochure like that before, let's hope another one comes up one day.

Well here is a photograph for you to digest, "is it a Standard or Orchard tractor"?? The only Orchard features I can see is the lower air stack and exhaust elbow, so I am sure it is a Standard Agricutural spec tractor on British rubbers, with electrics and two Orchard features.
Back in the early 90's when I bought the Wallis 12-20 which I am restoring at the moment it had a Orchard exhaust elbow on, the original owner was certain it had always had that type and never recalled a vertical exhaust, until now I believed it had been changed, but looking at this photograph it could of been on there all it's life.